Drew, the introduction date for Azochrome was set at Dec 8th 1941, but a certain event intervened, and it was impossible to get some materials from the suppliers as they were used for other purposes.

I have spent some time looking for the name of the Ciba researcher and some of the data, but have been unable to locate it. It is in a file labeled "Dye Bleach" which is oddly appropriate, but at present, is invisible to my tired old eyes.